I am building a server, I intend to have the OS on a RAID 1 array and the storage as a seperate RAID 5 array. The motherboard hardware RAID controller supports RAID 1 and I have purchased the High Point PCIE x 4 8x SAS/SATA RAID controller (link) for RAID 5. I could actually have the High Point controller managing both arrays or I could use the mobo hardware to manage the RAID 1 array and the controller add-in to manage the RAID 5. I think 2 different controllers managing each array would be fastest but I could not find any info on internets, perhaps someone here could confirm which setup would be faster? In the end if there is no speed difference then I would be more inclined to have the High Point card manage both arrays because the software funcionality, such as drive failure email alerts, seems really useful, either way love to hear what you have got to say!